Shifts of ortho-H2 NMR lines relative to HD in solid H2.
โ Scribed by D. Zhou; N.S. Sullivan
- Publisher
- Elsevier Science
- Year
- 1994
- Tongue
- English
- Weight
- 139 KB
- Volume
- 194-196
- Category
- Article
- ISSN
- 0921-4526
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โฆ Synopsis
We report measurements of the shifts of the ortho-H 2 NMR absorption lines relative to HD as a function of temperature (0.05 < T < 0.38 K) for an applied magnetic field of 6.3 T. At these fields the principal thermal polarization effect is the shift due to the i".] coupling between the nuclear spin I of the ortho-H 2 molecule and the orbital angular momentum J of the molecule if the latter is not quenched.
๐ SIMILAR VOLUMES
The anisotropic resonance frequency shift ~v= v(HD) -v(ortho-He singles) of the I H resonance spectrum observed in low ortho-concentration (X <\_ 0.01) solid He single crystal samples is examined The observed sign and magnitude of the resonance frequency shift as well as its anisotropy are explained
The theory of the formation of NMR multiple echoes for isotoexchange model predicts that the exchange in solid parapic impurities ( HD ) in solid para-H 2 has been developed for the H 2 would be comparable to that observed in solid 3 He case of weak quantum tunneling of the impurities. The results w
Using NMR techniques on two single crystals of H2, we have determined the crystalline field Vc that splits the rotational ground state of isolated ortho-H2 molecules in para-He. From the temperature-dependent splitting of the NMR doublet peak, we obtain an average Ivcl/kB = 0.0083 + 0.002 K independ